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Trouble
5. Sttch skppng
1 T he motons of the needle and
often occurs.
2 The clearance between the needle
3 The needle s bent.
4 The drver excessvely bends the
6. The needle
1 The needle thread tenson s not
thread comes
out on the wrong
2 The tenson release mechansm
sde of the mate-
ral.
3 The needle thread after thread
4 Number of sttches s too few.
5 When sewng length s short (End
6 Number of sttches s too few.
7. Thread end of
1 Sttch skppng at the 1st sttch
the 1st sttch
2 Needle used and thread used are
comes out on
the rght sde of
the materal.
3 Intermedate presser s not prop-
8. Threads break
1 The movng knfe has been m-
at tme of thread
trmmng.
9. The thread clamp
1 The needle thread at the sewng
s entangled wth
needle thread.
10. Uneven length of
1 The tenson of thread take-up
the needle thread
11. The length of
1 The tenson of thread tenson
needle thread
does not be-
2 The tenson of thread take-up
come short.
3 The tenson of thread take-up
12. The knottng
1 Idlng of bobbn s large.
secton of bob-
2 The bobbn thread tenson s too
bn thread at
2nd sttch at
3 The needle thread tenson at 1st
the sewng start
appears on the
rght sde.
13. W p e r f a l s t o
1 Needle entry of the last needle
work. (Return s
defectve.)
14. Short thread
1 Floppng of cloth
trmmng of
needle thread
at the tme of
2 The last sttch ptch s excessvely
thread trmmng
3 Thread trmmng speed s
Cause
shuttle are not properly synchro-
nzed.
and shuttle s too large.
needle.
hgh enough.
fals to work properly.
trmmng s too long.
of needle thread protrudes on the
wrong sde of sewng product.)
thck n terms of the nner dam-
eter of the ntermedate presser.
erly postoned n terms of the
needle.
properly poston.
start s too long.
sprng s too low.
controller No. 1 s too low.
sprng s too hgh.
sprng s too low and moton s
unstable.
low.
sttch s too hgh.
s the same as that of the sewng
start, and the resstance of thread
and cloth s large.
small.
excessvely fast.
Correctve measures
™ Correct the postons of the needle and
shuttle.
™ Correct the postons of the needle and
shuttle.
™ Replace the bent needle.
™ Correctly poston the drver.
™ Increase the needle thread tenson.
™ Check whether or not the tenson dsc
No. 2 s released durng bar-trackng.
™ Increase the tenson of the thread ten-
son controller No. 1.
™ Correct the poston of the movng knfe.
™ Turn OFF the thread clamp.
™ Turn OFF the thread clamp.
™ Use the lower plate, the hole of whch
s larger than the presser.
Adjust the hook tmng faster by a 1/2
™
sttch.
Increase the nner dameter of nterme-
™
date presser.
Adjust the eccentrcty between nter-
™
medate presser and needle so that
needle enters n the center of nterme-
date presser.
™ Correct the poston of the movng
knfe.
™ Tghten thread tenson controller No. 1
and make the length of needle thread
40 to 50 mm.
™ Increase the tenson of the thread take-
up sprng.
™ Increase the tenson of thread tenson
controller No. 1.
™ Decrease the tenson of thread take-up
sprng.
™ Increase the tenson of thread take-up
sprng and lengthen the stroke as well.
™ A just the poston of the movng knfe.
™ Increase the bobbn thread tenson.
™ Decrease the needle thread tenson at
1st sttch.
™ Turn OFF the thread clamp.
™ Shft the needle entry pont of the last
needle.
™ Lower the ntermedate presser heght
of the last sttch.
™ Decrease the stroke of the ntermedate
presser.
™ Increase the last sttch ptch.
™ Decrease the thread trmmng speed.
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